drbd: fix potential access of on-stack wait_queue_head_t after return

I run into something declaring itself as "spinlock deadlock",
 BUG: spinlock lockup on CPU#1, kjournald/27816, ffff88000ad6bca0
 Pid: 27816, comm: kjournald Tainted: G        W 2.6.34.6 #2
 Call Trace:
  <IRQ>  [<ffffffff811ba0aa>] do_raw_spin_lock+0x11e/0x14d
  [<ffffffff81340fde>] _raw_spin_lock_irqsave+0x6a/0x81
  [<ffffffff8103b694>] ? __wake_up+0x22/0x50
  [<ffffffff8103b694>] __wake_up+0x22/0x50
  [<ffffffffa07ff661>] bm_async_io_complete+0x258/0x299 [drbd]
but the call traces do not fit at all,
all other cpus are cpu_idle.

I think it may be this race:

drbd_bm_write_page
 wait_queue_head_t io_wait;
 atomic_t in_flight;
 bm_async_io
  submit_bio
					bm_async_io_complete
					  if (atomic_dec_and_test(in_flight))
 wait_event(io_wait,
	atomic_read(in_flight) == 0)
 return
					    wake_up(io_wait)

The wake_up now accesses the wait_queue_head_t spinlock, which is no
longer valid, since the stack frame of drbd_bm_write_page has been
clobbered now.

Fix this by using struct completion, which does both the condition test
as well as the wake_up inside its spinlock, so this race cannot happen.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 22 insertions, 16 deletions

diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index 314a3632303b..25428bc28476 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -897,7 +897,7 @@ void drbd_bm_clear_all(struct drbd_conf *mdev)
 struct bm_aio_ctx {
         struct drbd_conf *mdev;
         atomic_t in_flight;
-        wait_queue_head_t io_wait;
+        struct completion done;
         unsigned flags;
 #define BM_AIO_COPY_PAGES       1
         int error;
@@ -948,7 +948,7 @@ static void bm_async_io_complete(struct bio *bio, int error)
         bio_put(bio);
 
         if (atomic_dec_and_test(&ctx->in_flight))
-                wake_up(&ctx->io_wait);
+                complete(&ctx->done);
 }
 
 static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must_hold(local)
@@ -1009,8 +1009,12 @@ static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must
  */
 static int bm_rw(struct drbd_conf *mdev, int rw, unsigned lazy_writeout_upper_idx) __must_hold(local)
 {
-        struct bm_aio_ctx ctx =
-                { .flags = lazy_writeout_upper_idx ? BM_AIO_COPY_PAGES : 0 };
+        struct bm_aio_ctx ctx = {
+                .mdev = mdev,
+                .in_flight = ATOMIC_INIT(1),
+                .done = COMPLETION_INITIALIZER_ONSTACK(ctx.done),
+                .flags = lazy_writeout_upper_idx ? BM_AIO_COPY_PAGES : 0,
+        };
         struct drbd_bitmap *b = mdev->bitmap;
         int num_pages, i, count = 0;
         unsigned long now;
@@ -1031,10 +1035,6 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned lazy_writeout_upper_id
         num_pages = b->bm_number_of_pages;
 
         now = jiffies;
-        ctx.mdev = mdev;
-        atomic_set(&ctx.in_flight, 1); /* one extra ref */
-        init_waitqueue_head(&ctx.io_wait);
-        ctx.error = 0;
 
         /* let the layers below us try to merge these bios... */
         for (i = 0; i < num_pages; i++) {
@@ -1060,8 +1060,13 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned lazy_writeout_upper_id
                 cond_resched();
         }
 
-        atomic_dec(&ctx.in_flight); /* drop the extra ref */
-        wait_event(ctx.io_wait, atomic_read(&ctx.in_flight) == 0);
+        /*
+         * We initialize ctx.in_flight to one to make sure bm_async_io_complete
+         * will not complete() early, and decrement / test it here.  If there
+         * are still some bios in flight, we need to wait for them here.
+         */
+        if (!atomic_dec_and_test(&ctx.in_flight))
+                wait_for_completion(&ctx.done);
         dev_info(DEV, "bitmap %s of %u pages took %lu jiffies\n",
                         rw == WRITE ? "WRITE" : "READ",
                         count, jiffies - now);
@@ -1133,19 +1138,20 @@ int drbd_bm_write_lazy(struct drbd_conf *mdev, unsigned upper_idx) __must_hold(l
  */
 int drbd_bm_write_page(struct drbd_conf *mdev, unsigned int idx) __must_hold(local)
 {
-        struct bm_aio_ctx ctx = { .flags = BM_AIO_COPY_PAGES, };
+        struct bm_aio_ctx ctx = {
+                .mdev = mdev,
+                .in_flight = ATOMIC_INIT(1),
+                .done = COMPLETION_INITIALIZER_ONSTACK(ctx.done),
+                .flags = BM_AIO_COPY_PAGES,
+        };
 
         if (bm_test_page_unchanged(mdev->bitmap->bm_pages[idx])) {
                 dynamic_dev_dbg(DEV, "skipped bm page write for idx %u\n", idx);
                 return 0;
         }
 
-        ctx.mdev = mdev;
-        atomic_set(&ctx.in_flight, 1);
-        init_waitqueue_head(&ctx.io_wait);
-
         bm_page_io_async(&ctx, idx, WRITE_SYNC);
-        wait_event(ctx.io_wait, atomic_read(&ctx.in_flight) == 0);
+        wait_for_completion(&ctx.done);
 
         if (ctx.error)
                 drbd_chk_io_error(mdev, 1, true);